An aspiring writer goes to the airport to pick up a high school friend returning from a trip to Africa but is disheartened to see her with another man.

At his mother's 70th birthday party, Yong-nam runs into Eui-joo, who rejected him in college. When the city is engulfed in toxic gas from a terrorist attack, the two must find a way to escape using all the techniques they learned in their college rock climbing club.